课后编程3.17#include”stdio.h”main(){inta=560,h,m;h=a/60;m=a%60;printf(“560m=%3dh%3dm”,h,m);}3.18#include”stdio.h”main(){inta=1500,b=350,k,v;k=a/b;v=a%b;printf(“1500/350=%3d1500%%350=%3d\n”,k,v);}3.19#include”stdio.h”main(){doublea,b,c,x;scanf(“%lf%lf%lf”,&a,&b,&c);x=（a+b+c）/3;x=(int)(x*10+0.5);x=x/10;printf(“thisrerultis%.1lf”,x);}3.20#include”stdio.h”main(){inta,b,c,t;scanf(“%d%d%d”,&a,&b,&c);t=c;c=b;b=a;a=t;printf(“a=%3db=%3dc=%3d”,a,b,c);}4.21#include”stdio.h”main(){inta,m;scanf(“%d”,&a);switch(a/10){case0:case1:case2:m=1;break;case3:m=2;break;case4:m=3;break;case5:m=4;break;default:m=5;}printf(“%d\n”,m);}4.22#include”stdio.h”main(){inty0,m0,d0,y1,m1,d1,y,m,d;scanf(“%d%d%d”,&y0,&m0,&d0);scanf(“%d%d%d”,&y1,&m1,&d1);if(d1<d0){d1=d1+30;m1=m1-1;}d=d1-d0;if(m1<m0){y1=y1-1;m1=m1+12;}m=m1-m0;y=y1-y0;printf(“%dy%dm%dd”,y,m,d);}4.23#include”stdio.h”main(){inta,k;scanf(“%d”,&a);k=a%2?0:1;if(k)printf(“偶数\n”);elseprintf(“奇数\n”);}4.24#include”stdio.h”main(){inta,b,c,max;scanf(“%d%d%d”,&a,&b,&c);max=a;if(max<b)max=b;if(max<c)max=c;printf(“max=%d\n”,max);}4.25(1)#include”stdio.h”main(){intx,y;scanf(“%d”,&x);if(x>-5&&x<0)y=x;if(x==0)y=x-1;if(x>0&&x<10)y=x+1;if(x>-5&&x<10)printf(“y(%d)=%d”,x,y);}(2)#include”stdio.h”main(){intx,y;scanf(“%d”,&x);if(x>-5&&x<10){if(x<0)y=x;if(x==0)y=x-1;if(x>0)y=x+1;printf(“y(%d)=%d”,x,y);}}(3)#include”stdio.h”main(){intx,y;scanf(“%d”,&x);if(x>-5&&x<0)y=x;elseif(x==0)y=x-1elseif(x>0&&x<10)y=x+1;if(x>-5&&x<10)printf(“y(%d)=%d\n”,x,y);}(4)#include”stdio.h”main(){intx,y;scanf(“%d”,&x);switch(x>-5&&x<0?0:x==0?1:x>0&&x<10?2:3){case0:y=x;break;case1:y=x-1;break;case2:y=x+1;break;}if(x>-5&&x<10)printf(“y(%d)=%d\n”,x,y);}5.17#include”stdio.h”main(){intx,f=1,sum=0;for(x=1;x<=101;x++,x++){sum=sum+f*x;f=-f;}printf(“1-3+5-7……-99+101=%d\n”,sum);}5.18(1)用循环嵌套#include”stdio.h”main(){doublee=1,p;inti,n;